There is a photograph floating around in the WWW somewhere which shows Baden's launch ceremony; don't ask me where, I only saw it, but never downloaded it. That one shows the bow crest attached, although it was apparently removed soon after launch. So I think there's no problem putting the large crest on the picture, I'm sure they stored it somewhere to be re-attached after the war. I would not put it on the actual ship, though, because I have not seen any photograph that shows Baden with bow crest.
Thank you for the praise Novice, and thank you for the photo, I do have that one, although I have it saved as Baden's launch, I believe it to be either Sachen or Wurttemberg due to the lack of any ceremony during the launch.
Sachsen, Bayern class battleship
Württemberg, Bayern class battleship
SMS Goeben, Moltke class battlecruiser
SMS Blucher armoured cruiser
MD Scale, 4 Pixels : 1 Foot
Official German Parts Sheet
German Capital Ship Projects of The First World War